stunt2

iTrader: (8)

this is the piston from my buddys's car and he asked me to open this thread
wants to know what can be possible reason of such damage
high EGT's I think ?
happened to only one piston (to the second or third)


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the skirt of the opposite side of the damage


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wreckleford

iTrader: (2)

Detonation. The piston looks tiny in the first pic. What car did it come out of?

Bejo

It's from evo 4

EVO-EVO-EVO

Maybe a faulty fuel injector in that cylinder causing a lean condition and then detonation.

Bejo

wreckleford

iTrader: (2)

This will happen sometimes even without a faulty injector. Some cylinders will just be leaner than other or hotter than others and if the tune is on the edge it will take out 1 piston before the others.

AreSTG

iTrader: (4)

that's a LOT of pitting

evolve_VIII

iTrader: (11)

Looks a little lean. Thats what mine looked like when my fuel pump went out during a pull. I noticed the car about fell flat on its face and the AFR was in the 14.7 range at WOT. New pistons for me.

batty200

iTrader: (3)

This is why I run my average AFR at the wide band rich. There will be leaner cylinders than others. Waste gas and haul ***.